In PERT project management, the activity variance (sigma^2) is calculated using optimistic (a) and pessimistic (b) time estimates as:
A[(b - a) / 6]^2
B[(b + a) / 6]^2
C[(b - a) / 4]^2
D[(b - m) / 6]^2
Explanation
Standard deviation in PERT is sigma = (b – a) / 6. Therefore, variance sigma^2 = [(b – a) / 6]^2.

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